For manual, high-intent pages, Google’s Indexing API remains the gold standard....

https://wiki-fusion.win/index.php/How_to_Explain_Indexing_Delays_Without_Sounding_Defensive

For manual, high-intent pages, Google’s Indexing API remains the gold standard. When managing mass-scale link campaigns, third-party indexers often provide the necessary lift, with some services costing around $29 for 60 credits